I was in same boat a year ago, used a tiny harbor freight pipe wrench,
you know the plumbers type.  I'm assuming you do not intend to reuse
sensor.

I had tried pb blaster, wax, sockets, box wrench, vice grips, etc.
The pipe wrench worked like a charm. Found out about it in the archives

Ryan

Sent from my iPod

On Nov 23, 2010, at 21:41, Harry Hoffman <hhoffman@IP-SOLUTIONS.NET>
wrote:

> Hi All,
>
> I'm trying to remove my o2 sensor but it's rusted in place. I've tried
> quite a bit of liquid wrench, along with a set of locking pliers and a
> hammer. No dice.
>
> How do other people get the sensor off without destroying the cat?
>
> Cheers,
> Harry
>